2027 ICD-10-CM Diagnosis Code Q79.1Other congenital malformations of diaphragm
ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q79
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- POA Exempt
- Chronic Condition
Q79.1 is a billable ICD-10-CM diagnosis code for other congenital malformations of diaphragm. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 205 through 206. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 3 closely related codes. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Musculoskeletal congenital conditions.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q79.1 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations and deformations of the musculoskeletal system (Q65-Q79).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Agenesis of diaphragm
- Aplasia of diaphragm
- Congenital absence of diaphragm
- Congenital absence of left hemidiaphragm
- Congenital absence of right hemidiaphragm
- Congenital absent hemidiaphragm - bilateral
- Congenital anomaly of diaphragm
- Congenital anomaly of pericardium
- Congenital cleft hand
- Congenital diaphragmatic hernia
- Congenital eventration of diaphragm
- Congenital eventration of left crus of diaphragm
- Congenital eventration of right crus of diaphragm
- Congenital hypoplasia of diaphragm
- Congenital posterolateral diaphragmatic hernia
- Diaphragmatic defect, limb deficiency, skull defect syndrome
- Diaphragmatic eventration
- Elevated diaphragm
- Pericardial and diaphragmatic defect syndrome
- Pericardial anomaly
- Split hand, obstructive uropathy, spina bifida, diaphragmatic defect syndrome
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q79.1: its own notes plus those printed at Q79 and Chapter 17. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Absence of diaphragm
- Congenital malformation of diaphragm NOS
- Eventration of diaphragm
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- congenital (sternomastoid) torticollis (Q68.0)
Notes
General instructions on how these codes are used.
- Codes from this chapter are not for use on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Q79.1, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Abnormal, abnormality, abnormalities See Also: Anomaly;
Enlargement, enlarged See Also: Hypertrophy;
Eventration See Also: Hernia, ventral;
diaphragm (congenital) Q79.1
diaphragm (congenital) Q79.1
Malformation (congenital) See Also: Anomaly;
diaphragm Q79.1
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Birth Defects
A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.
The full article covers:
- What are birth defects?
- What causes birth defects?
- Who is at risk of having a baby with birth defects?
- How are birth defects diagnosed?
- What are the treatments for birth defects?
- Can birth defects be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Q79.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q79.1Overview
What is the ICD-10 code for other congenital malformations of diaphragm?
The ICD-10-CM code for other congenital malformations of diaphragm is Q79.1 (sometimes written as Q791). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q79.1 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other congenital malformations of diaphragm on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q79.1 group to?
When other congenital malformations of diaphragm is the principal diagnosis on an inpatient stay, it groups to MS-DRG 206, 205, with relative weights from 0.9255 to 1.8244 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q79.1 a CC or MCC?
CMS lists Q79.1 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 3 closely related codes in its exclusion list.
Is Q79.1 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for other congenital malformations of diaphragm on inpatient claims. The code appears in the Congenital malformations and deformations of the musculoskeletal system (Q65-Q79) range of the CMS exempt list.
